In 1999, the Quispisisa Source of obsidian was located in the Province of Huanca Sancos in central Ayacucho near the village of Sacsamarca. This discovery has been confirmed at the University of Missouri Research Reactor (MURR) by comparing the neautron activation analyses of source samples with artifacts. The Quispisisa source of volcanic glass provided the raw material for most of the obsidian artifacts utilized in central and northern Peru throughout prehispanic times.